Plastic composition



UNl TED- STATES PATENT "or-rice.

ELIEL L. SHABPNECK, OI BAKI EBSFIEILD, CALIFORNIA.

r 1,379,052. 1T0 Drawing. I

, To all whom it may com-em:

5 of California, 'have invented certain new and useful Improvements 1n Plast c Compositions, of which the following" is a specification.

This invention' relates to plastic compositions, and particularly to composltlons'to vbe used in pavingroadways, streets, sidewalks, reservoir linings, building-blocks, and such other uses as the same maybe applied to. I

A further object is to provlde an improved composition for these purposes, of such material that the asphaltum, which forms one of the main ingredients, will be rendered resistant to the action of sun heat, this feature adding greatly to durability and especially to the lasting quality of roadways. A further object is to combine with the asphaltum a material which will prevent the asphalt from becoming soft or running in hot weather, this result to be accomplished without destroying the ductility or adheslve qualities of the asphalt.

A, further object is to provide a composition which will be of such character that, by its use, roadways may be constructed at considerably less expense than the costof cohcrete or other material ordinarilyused for that purpose. Other objects wil-l'appear in the course of the following description;

earthy matter .or mixture'thereof, preferably and for most purposes, screened sand being used, to which a certain amount of Portland cement has been added. The filler is mixed withrnineral asphaltum to which has been added .a certain percentage of pulverized borax.

'To prepare the above composition, the

, sand, if sand is used as. a-filler, is thoroughly screened so that jthe grains will be practically of uniform. size and all coarse vege table matter removed; Th1s screened sand is then heated and thoroughly dried to Te ing, the filler'is heated to a temperature of 300m 350 degrees F., and while in this heated condition and before the asphalt is mixed with it,"-there is added Portland ce- -ment. -The inineralasphaltum (which has preferably 40 to degrees penetration) is Specification of Letters Patent.

proximate'heat of 300 to 350 degrees This composition includes a finely divided 3 filler which mayconsist of any soil, sand,

,to vthe v .I-have oundin actual tests that a roadway move moisture before being mixed. in mixrnas'rrc oourosrrron.

heated to the. same temperature as the Patented May 24, 1921. Application filed au ust 12,- 1920. Serial No. 402,993.

filler,that is to say: 300 to 350 degrees F., I

and when the asphaltum has attained the proper'temperaturethere is added to. it a certain percentage of pulverized borax which throws the asphalt into a high state of eifervescence which increases' the volume of. asphalt several times, the asphalt and filler-being mixed-while the asphalt is efiera vescing, andthe. mixing being continueduntil the mass is of a uniform black color, and whlle the 'mass'is maintained at an ap- I do not wish to. be limited 'to any particular proportions of the ingredients above called for, as these proportions will vary under. different circumstances.

screened sand filler, however, the best resultsare attained by using the materials in the following proportions:

With r Screened sand filler .86 per cent. Asphaltum, 50 to 60 degrees penetration 8per cent. Portland cement f 5 per cent. Pulverized borax 1 percent.

For a filler consisting of earth, in which i no sand is mixed, such as clay or other forms of l1kecharacter,.the proportions should be about as follows: p

Asphaltum 20 per cent. Portland cement 5 percent. Pulverized borax- 2. 5 percent.v

It will be understood that these proportrons are variable',;particularly with regard roportions of filler to asphaltum.

formed in accordance with the ordinary formulas. It will also be noted that this mix- 7 2. 5 per cent.

ture or composition is of particular value in that the asphalt is not actedupon to any disadvantage by the heat'of thesun. At

the same time, they whole mass is rendered Im FGEVIOHS-tO water.

he heating of the'fillera'nd of the other ingredients to 300 or 350 degrees F. 'whilebeing mixed and applied, is of great importance, sinceheating operates to remove a large percentage of air included withinthe mass; and thus, when the mass is primed into place by a'roller, the particles will be' I forced into close contiguitywith each other,-

and thus the density-0f the mass will be increased, rendering the resultant pavement very dense and hard.

What I claim is, r l. A plastic composition comprising approximately 73 to 86 per cent. of a finely divided filler 8 to- 20 per cent. of mineral asphaltum, 1 to per cent; of pulverized borax and 5 per cent. of Portland cement.

2. A method of forming plastic compositions which consists in mixing a finely di-' vided filler and Portland cement together and heating to a te'mperatureo-f 300 to 350 degrees F., also heating minera] asphaltum to a temperature of 300 to 350 degrees F. adding pulverized borax thereto, then mix ing the asphaltum with the filler while the asphaltum is in-a high state kit-effervescence andwhi-le the mass is maintained at a temperature of 300v to 350 degrees-F.-.

I In testimony whereof, I have afiixed my 

